Topical antibiotics: very few indications for use

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Topical antibiotics: very few indications for use
Topical antibiotics:
very few indications for use
26
Topical antibiotics: very few indications for use
Topical antibiotics in general have been excessively used in New Zealand in recent years. The increasing
prevalence of resistance to fusidic acid in Staphylococcus aureus means that treatment will often be
ineffective. Topical antibiotics may be considered for patients with localised areas of impetigo. Antibiotic
treatment, whether given topically or orally, is rarely indicated for the treatment of patients with furuncles
(boils) or carbuncles (multiple headed lesions). Oral antibiotics, but not topical antibiotics are indicated for
wound infections, cellulitis or other deeper skin infections. It is important to reconsider the use of topical
antibiotics in skin infections and reduce inappropriate prescribing.

 The role of topical antibiotics in the treatment                      appropriate for patients with more extensive areas of infection
 of minor skin infections                                              or systemic symptoms. Fusidic acid may also be considered for
                                                                       treating patients with small, localised areas of infected eczema,
  1. Not all patients with a skin infection require an antibiotic
                                                                       however, oral antibiotics are more likely to be required as
     (Table 1)
                                                                       infected eczema is often extensive.
  2. If an antibiotic is required, topical antibiotics are only
     appropriate for patients with minor, localised areas of
                                                                       Topical mupirocin should be reserved for treating patients
     impetigo
                                                                       with localised mild skin infections (impetigo or infected
                                                                       eczema), that are resistant to fusidic acid and have sensitivity
 Most minor skin infections are self-limiting and resolve without      to mupirocin.
 the use of an antibiotic (with standard skin hygiene advice). The
 decision to treat will be determined by several factors, including    Antibiotic management of impetigo
 the extent and severity of infection, the patient’s co-morbidities    Topical treatment with fusidic acid may be considered for
 and socioeconomic status (e.g. living environment).                   a patient with no more than three areas of impetigo or an
                                                                       area of infection of less than 5 cm2.2 Response to treatment
 Despite increasing bacterial resistance to fusidic acid, it remains   should be regularly assessed, and a switch to oral antibiotics
 a valid treatment option for patients with localised areas of         considered if the infection is not resolving or is worsening. A
 impetigo caused by Staphylococcus aureus, Streptococcus               swab for culture and sensitivity will help to guide treatment
 pyogenes or other related streptococci.2 Oral antibiotics are         in this case.

 Table 1: General guidance for use of antibiotics for skin infections most commonly seen in general practice1

   Antibiotics (topical or oral) rarely        Topical antibiotics may be                   Oral antibiotics (not topical) usually
   required                                    considered                                   indicated

   Furuncles (boils)                            Impetigo (small, localised patches)         Infected wounds, including bites

   Carbuncles (multiple headed lesions)        Occasionally considered for infected         Cellulitis
                                               eczema (small, localised patches, not
   N.B. In most cases these can be                                                          Widespread impetigo or infected
                                               improving with standard care)
   treated with incision and drainage                                                       eczema

                                                                                            Mastitis

                                                                                                                         BPJ Issue 64   27
Topical antibiotics: very few indications for use
The history of fusidic acid use in New Zealand

     Fusidic acid is a relatively narrow-spectrum antibiotic,                                                   decade,11 which may account for some of the additional
     active against Gram-positive bacteria, such as                                                             use of topical antibiotics.
     Staphylococcus and Streptococcus spp. It is most commonly
     used in topical form. Fusidic acid belongs to the fusidane                                                 This change in prescribing also had an effect on bacterial
     class (a fungal derivative), with a chemical structure                                                     resistance to both fusidic acid and mupirocin. The
     similar to corticosteroids, although it does not have anti-                                                prevalence of resistance in S. aureus to mupirocin, which
     inflammatory properties.8                                                                                  was 28% in 1999 (based on a national survey of isolates
                                                                                                                from community and hospital laboratories),12 had fallen
      Fusidic acid has been available for many years in New                                                     to 11% in 2013 (based on a survey of isolates from
      Zealand, however, use has increased significantly over the                                                an Auckland community laboratory).9 In contrast, the
      past decade. This occurred after restrictions were placed                                                 increased level of prescribing of fusidic acid over recent
      on another topical antibiotic, mupirocin, which has similar                                               years resulted in a rapid rise in the prevalence of resistance,
      activity to fusidic acid. Mupirocin was available as an                                                   from 17% in 1999,12 to 29% in 2013.9
     “over-the-counter” medicine from 1991, however, its status
      reverted to a prescription only medicine in 2000. This                                                    Latest antibiotic resistance surveillance data from ESR
      was due to concerns over increasing bacterial resistance,                                                 (from both community and hospital laboratories) show
      particularly in methicillin-resistant Staphylococcus                                                      that in 2012, 15% of all sampled S. aureus isolates were
      aureus (MRSA). This resulted in a significant reduction in                                                resistant to fusidic acid, compared to 8% resistant to
      dispensing of mupirocin, but at the same time, dispensing                                                 mupirocin.13 Of those isolates which were methicillin-
      of fusidic acid increased as topical antibiotics continued                                                resistant (i.e. MRSA), 37% were resistant to fusidic acid and
      to be widely prescribed.9                                                                                 10% resistant to mupirocin.13

     The total number of community-dispensed prescriptions                                                      It appears that the increased and widespread use of
     of topical fusidic increased from approximately 146 000                                                    fusidic acid has rapidly resulted in it becoming a much
     in 2008 to approximately 220 000 in 2013 (Figure 1).10 The                                                 less effective antibiotic treatment for the skin infections it
     incidence of S. aureus skin infections in New Zealand has                                                  is indicated for, i.e. localised areas of impetigo.
     increased by approximately 5% each year over the last

                                                       300 000                                                                     100 %                        Figure 1: Number of
         Number of community-dispensed prescriptions

                                                                        Fusidic acid          MRSA resistance to fusidic acid
                                                                                                                                                                community-dispensed
                                                                                                                                   80
                                                                                                                                                                prescriptions for fusidic
                                                                                                                                                                acid between 2008 – 2013,
                                                                                                                                        MRSA resistance rates

                                                       200 000                                                                                                  and MRSA resistance rates
                                                                                                                                   60                           to fusidic acid10, 14

                                                                                                                                   40
                                                       100 000

                                                                                                                                   20

                                                            0                                                                      0
                                                                 2008          2009    2010          2011     2012       2013
                                                                                              Year

28   BPJ Issue 64
Topical antibiotics: very few indications for use
Advise the patient/carer to remove crusted areas on lesions,                     Where possible, topical emollients and medicines should be
with warm water and a soft, clean cloth.3 Apply fusidic acid                     provided in a tube or pump dispenser to reduce the risk of
2% ointment or cream to lesions three times daily, for seven                     contamination. Emollients in a tub should be scooped out for
days.1, 2                                                                        application to skin using a spoon or ice-cream stick. After an
                                                                                 infection patients/carers should be advised to discard and
Oral antibiotics are more appropriate than topical treatment                     renew topical medicines in tubs, as they may have become
for patients with widespread lesions or if systemic symptoms                     contaminated.4, 5
are present. The recommended oral antibiotic treatment is
flucloxacillin:1                                                                 Recurrently infected eczema is usually due to under-treatment
      Child – 12.5 mg/kg/dose, four times daily, for five to
                                                         *                       of the eczema. Factors such as adherence should be addressed,
      seven days                                                                 and a referral made to dermatology if eczema persists despite
      Adult – 500 mg, four times daily, for five to seven days                   primary care intervention.

* If compliance is an issue, an alternative regimen is flucloxacillin 10 – 25
  mg/kg/dose, three times daily (maximum 500 mg per dose) for five to            Combination topical antibiotic + corticosteroid
  seven days.2 To optimise absorption, oral flucloxacillin is ideally taken on   Several topical combination antimicrobial/corticosteroid
  an empty stomach.
                                                                                 products are available in New Zealand. Fusidic acid is
                                                                                 combined with betamethasone in Fucicort (partly subsidised).
Cephalexin has been recommended as an option for                                 Pimafucort contains hydrocortisone, natamycin and neomycin
children who find flucloxacillin syrup unpalatable,2 however,                    (fully subsidised).6
consideration should be given to the disadvantages of using an
unnecessarily broad spectrum antibiotic and the effect on the                    These products are best reserved for treating small areas of
spread of antimicrobial resistance (see: “Antibiotic resistance                  localised infection in patients with an underlying inflammatory
in New Zealand, Page 24). Erythromycin is an alternative for                     skin condition that will respond to a corticosteroid.6 For
patients with penicillin allergy. If MRSA is found to be present,                example, Fucicort may be considered for a patient with a
the recommended treatment is oral co-trimoxazole (see:                           small area of eczema (in which a corticosteroid is part of the
New Zealand Formulary or the bpacnz antibiotic guide for                         treatment regimen) with a secondary bacterial infection (for
recommended doses of these medicines).                                           which fusidic acid may be appropriate). Pimafucort may, for
                                                                                 example, be considered for the treatment of a patient with
In children with impetigo, the affected area should be kept                      superficial skin lesions that will respond to corticosteroids,
covered and the child excluded from day-care or school until                     complicated by a secondary candidal infection.6
24 hours after antibiotic treatment has been initiated.3
                                                                                 It is recommended that these combination products are used
     Information and resources for families about impetigo                       regularly, for a short time period, e.g. twice daily, for seven
are available from: www.kidshealth.org.nz/impetigo-school-                       days.6
sores
                                                                                 Fucicort and Pimafucort are
Antibiotic management of infected eczema                                         not appropriate for the
A topical antibiotic may be considered for patients with a                       treatment of acne vulgaris.
small area of infected eczema (a single patch < 5 cm2), that                     To p i c a l    antibiotics
is not resolving with usual eczema management (including                         (e.g.        clindamycin,
antiseptic baths).4, 5 Advise the patient/carer to apply fusidic                 erythromycin) are no
acid 2% ointment or cream to the infected area three times                       longer funded for the
daily, for seven days. A combination fusidic acid/corticosteroid                 treatment of acne
product is also an option (see opposite).                                        but may be used for
                                                                                 patients with mild
Oral antibiotics are appropriate when the infection is more                      inflammatory acne which
widespread (i.e. > 5 cm2), if there is more than one area of                     does not respond to topical
infection or if systemic symptoms occur. 5 The same oral                         retinoids or where topical
antibiotic regimen as recommended for impetigo can be                            retinoids are not tolerated.7
used.

                                                                                                                                 BPJ Issue 64   29
Preventing recurrent skin infections
The emergence of MRSA                                             S. aureus skin infections in New Zealand have increased
Penicillin was first used to treat S. aureus infections, but      significantly over the past decade.11 More people are being
now approximately 90% of isolates in New Zealand are              hospitalised with skin infections, and there is an increase in
resistant.13 Methicillin (a semi-synthetic penicillin) and        the number of infections being reported in the community.11
other closely related antibiotics, such as flucloxacillin,        The incidence rate of patients hospitalised with S. aureus skin
dicloxacillin and cloxacillin, were then used to treat S.         infections in the Auckland DHB region increased from 81 cases
aureus infections, but this led to the “super bug” methicillin-   per 100 000 people in 2000 to 140 cases per 100 000 people
resistant S. aureus (MRSA) which became endemic in many           in 2011, which represents an increase of approximately 5%
hospitals in New Zealand in the 1990s.12 Measures were            per year.11 Māori and Pacific peoples, adults aged over 75
implemented to control MRSA, and levels in New Zealand            years, children aged under five years and people living in more
hospitals are now lower than in many other countries,             deprived areas have been found to have a higher incidence of
such as the United States.15 In 2013, the national rate           hospitalisation for S. aureus infection.11 Factors contributing
of MRSA in New Zealand was 23.9 cases per 100 000                 to the high rates of S. aureus infections in New Zealand are
people,16 however, there are significant geographical             thought to include delayed access to health care, increasing
variations in incidence. The DHB regions with the highest         overcrowding in households and declining socioeconomic
MRSA incidence rates per 100 000 people in 2013 were              circumstances in some population groups.11
Northland (60.5), Counties Manukau (54.9) and Tairawhiti
(53.5).16                                                         With the high rates of S. aureus skin infections in New
                                                                  Zealand and the increasing emergence of resistant strains, it
                                                                  is important that measures are put in place to reduce the risk
                                                                  of recurrent infections, especially among households. This
                                                                  primarily involves educating patients and their families about
                                                                  infection control measures and the principles of good hygiene.
                                                                  A formal decolonisation regimen, using topical antibiotic and
                                                                  antiseptic techniques, is not necessary for all patients, but
                                                                  may be appropriate for those with recurrent staphylococcal
                                                                  abscesses.

                                                                  General messages for preventing skin infections
                                                                  General lifestyle and hygiene measures can be discussed with
                                                                  families to reduce the likelihood of skin infections.

                                                                  These include:17
                                                                      Use an emollient to treat dry skin
                                                                      Ensure that skin conditions such as dermatitis or eczema
                                                                      are optimally managed
                                                                      If skin is dry or damaged, avoid soaps which can irritate
                                                                      the skin, and prolonged exposure to hot water
                                                                      Where possible, store and use skin products from pump
                                                                      or pour bottles, rather than jars
                                                                      Keep fingernails and toenails trimmed and clean
                                                                      Do not share personal hygiene items such as hairbrushes,
                                                                      razors, facecloths and towels, and regularly clean these
                                                                      items
                                                                      Wash and dry hands after using the toilet and before
                                                                      eating

30   BPJ Issue 64
Wash clothes, towels and sheets regularly; if a family              fusidic acid the patient should be treated with fusidic
    member has a skin infection, ideally use hot water                  acid 2% cream or ointment, applied inside each nostril
    and dry items in a hot clothes dryer (although                      (with a cotton bud or finger), twice daily, for five days.
    acknowledging that this is often not affordable for
                                                                        If S. aureus is present and the isolate is resistant to
    families). A hot iron can be used after clothes are dry.
                                                                        fusidic acid, but sensitive to mupirocin, the same
    Regularly wash toys using a mild disinfectant – hard                treatment regimen should be undertaken, but with
    toys can be washed in a dishwasher, soak soft toys prior            mupirocin 2% ointment.
    to washing; there is no evidence that freezing soft toys
    reduces bacterial contamination18                                   If S. aureus is not present or if the isolate is resistant to
                                                                        both fusidic acid and mupirocin, topical treatment is not
    If a skin injury occurs, clean and cover it to help prevent
                                                                        indicated. Systemic antibiotics may be required in some
    infection and regularly change the dressing
                                                                        patients with particularly resistant strains of S. aureus;17
    Avoid scratching skin lesions
                                                                        discuss this with an infectious diseases specialist.
    Avoid sharing bath/cleaning water when a member of
    the family has a skin infection
    Avoid swimming in unclean/untreated water if an open            Bleach baths or antiseptic washes should also be used
    wound is present                                                To help reduce the bacterial load, patients undergoing S. aureus
                                                                    decolonisation should also be advised to shower or bathe for
    Information for families is available from: www.health.         one week using an antiseptic.
govt.nz/system/files/documents/publications/looking-
after-your-childs-skin-treating-skin-infections-guide-              For a bleach bath, add 1 mL of plain unscented 5% bleach
parents-caregivers-nov-13.pdf                                       per 1 L of bathwater (or 2 mL of 2.2% bleach per 1 L of water).
                                                                    Products that contain added detergent (e.g. Janola) are not
                                                                    recommended. N.B. A regular-sized bath filled to a depth of
Decolonisation of S. aureus in patients with recurrent              10 cm contains approximately 80 L of water and a baby’s bath
abscesses                                                           holds approximately 15 L of water.19
Patients presenting in primary care with recurrent
staphylococcal abscesses (furuncles or carbuncles) are likely to    After immersing in the bath water for 10 – 15 minutes, rinse
be carrying a high bacterial load of S. aureus (some with MRSA),    with fresh water. The bleach bath should be repeated two to
which is causing multiple re-infections when skin becomes           three times within the week.
damaged, e.g. through scratching or injury. The most common
site of staphylococcal colonisation is inside the nostrils. Other        A patient/carer handout on instructions for a bleach bath
frequently colonised sites include the groin, perineum, axillae     is available from:
and pharynx. There is conflicting evidence as to whether            www.kidshealth.org.nz/sites/kidshealth/files/pdfs/bleach_
undergoing staphylococcal decolonisation results in fewer skin      bath_handout.pdf
infections (see: “Evidence of effectiveness of decolonisation
measures”, over page). However, if a patient with recurrent         Alternatively, patients may shower daily for one week, using
staphylococcal abscesses (or their parents/carers) is likely to     triclosan 1% or chlorhexidine 4% wash. The wash can be
be compliant with a decolonisation regimen, it is reasonable        applied with a clean cloth, particularly focusing on the axillae,
to try this. Treatment to eliminate S. aureus colonisation in the   groin and perineum. Although difficult in a showering situation,
most affected member of the household is usually all that is        the antiseptic should ideally be left on the skin for at least five
required to prevent recurrences in all household members.           minutes before being rinsed off. Hair can be washed with the
                                                                    antiseptic also.17
Decolonisation should only begin after acute infection has
been treated and has resolved.                                      Bleach baths or antiseptic washing can be carried out
                                                                    intermittently after the initial decolonisation period, to
The first step is to take a nasal swab to determine whether the     help prevent recurrence of infection. 17 This can also be
patient has S. aureus nasal colonisation and if so, whether the     recommended for patients with recurrent skin infections who
S. aureus colonising the patient is sensitive to fusidic acid or    have not undergone formal decolonisation.17
mupirocin:
    If S. aureus is present and the isolate is sensitive to

                                                                                                                       BPJ Issue 64   31
Mouth gargle                                                       Ideally, the household should also replace toothbrushes,
As S. aureus can also colonise the pharynx, an antiseptic throat   razors, roll-on deodorants and skin products. Hair brushes,
gargle (e.g. chlorhexidine 0.2% solution, three times daily) is    combs, nail files, nail clippers can be washed in hot water or
also recommended for the duration of formal decolonisation         a dishwasher.17
treatment.17
                                                                   Surfaces that are touched frequently, such as door handles,
Linen and clothing can also be decolonised                         toilet seats and taps, should be wiped daily, using a
To support the decolonisation regimen, potentially                 disinfectant, e.g. alcohol wipes, bleach.17
contaminated clothing, towels, facecloths, sheets and other
linen in the household should be washed then dried on a hot        Soft furnishings that cannot easily be cleaned, e.g. couches
cycle in a clothes dryer, or dried then ironed. Clothing and       and arm chairs, can be covered in a sheet or blanket that is
linen that is white or colourfast can be washed with diluted       regularly washed.
household bleach. Washing is recommended twice within the
one week decolonisation period.17

      Evidence of effectiveness of                                 The eradication of S. aureus was thought to be more
      decolonisation measures                                      successful in the group who used mupirocin + bleach
                                                                   compared to other groups, because soaking in the bleach
      There is mixed evidence of the effectiveness of formal       bath allowed fuller body exposure to the antiseptic and
      decolonisation regimens in reducing recurrent infections     a longer period of contact, therefore increasing the
      in patients with persistent carriage of S. aureus. A 2003    antimicrobial effect of the intervention.21
      Cochrane review of six randomised controlled trials did
      not find evidence to support decolonisation of patients      As the effect of the initial interventions was not sustained
      with MRSA, with either topical or systemic methods.20        over time it may suggest that decolonisation regimens
      However, further trials have subsequently been published,    should be repeated regularly to successfully eradicate S.
      some with more positive results.                             aureus. However, there is currently no evidence to support
                                                                   the efficacy of this approach.
     A recent United States-based study randomised patients
     with S. aureus colonisation to receive hygiene education      N.B. Mupirocin was used in this study, but is only
     only, education + 2% mupirocin ointment applied               recommended in New Zealand if colonisation with S.
     inside the nostrils, twice daily for five days; education     aureus that is resistant to fusidic acid and sensitive to
     + mupirocin + chlorhexidine 4% body wash daily; or            mupirocin has been confirmed.
     education + mupirocin + bleach bath daily.21 After one
     month, the rate of S. aureus nasal colonisation in patients
     who received mupirocin (27%), mupirocin + chlorhexidine
     (26%) and mupirocin + bleach (17%) was approximately
     half that in patients who received education alone
     (46%).21 However, after four months, only the group who
     received mupirocin + bleach had significantly lower rates
     of S. aureus nasal colonisation (15%) compared to those
     who received education alone (50%). The group who
     received mupirocin + chlorhexidine had a significantly
     lower rate of recurrent skin infections after one month
     (11%) compared to the group who received education
     alone (26%). However, there was no effect on the rate
     of skin infections at either four or six months after the
     intervention.21

32   BPJ Issue 64
The role of topical antiseptics in treating skin                     Povidone iodine is one of the more frequently used antiseptics.
infections                                                           It has been shown to reduce the bacterial load in wounds and
                                                                     not to impede healing, however, there is no evidence that it
Antiseptics slow or stop the growth of micro-organisms               increases the rate of wound healing.23
on external surfaces of the body, i.e. the skin and mucus
membranes, and help to prevent infections.22 Antiseptics have        Hydrogen peroxide does not negatively affect wound healing,
broad-spectrum bactericidal activity and can also act against        but it is thought to be ineffective at reducing bacterial count.23
fungi, viruses and protozoa.23 There has been recent interest        It may be useful as a chemical debriding agent.23
in the use of antiseptics for treating skin infections, to help to
reduce the use of topical antibiotics. Antiseptics contribute to     Chlorhexidine does not adversely affect wound healing, and is
bacterial resistance to some degree, but not to the extent that      likely to be useful as a rinse, but it is uncertain how effective it
antibiotics do. This is because antiseptics generally eliminate or   is in preventing infection in open wounds.23
inhibit all bacteria, whereas antibiotics act only on susceptible
bacteria.23                                                          Antiseptics are not usually associated with bacterial
                                                                     resistance
There is currently a lack of evidence to support the use of          Although there have been isolated reports of bacterial
topical antiseptics in the treatment of minor skin infections.       resistance to povidone iodine, the consensus is that iodine-
However, they do have a role in preventing infection in              resistant strains of micro-organisms have not yet emerged,
wounds.24 Like topical antibiotics, antiseptics only work on         after over 150 years of use of iodine-containing antiseptics.25
external surfaces of the body and do not have any effect on          There have been no reports of bacterial resistance to hydrogen
systemic infections.22                                               peroxide. Some bacterial resistance has been reported to
                                                                     quaternary ammonium antiseptics (Pseudomonas aeruginosa),
In general, antiseptics may be used for:22                           chlorhexidine (staphylococci) and triclosan (P. aeruginosa).25, 26
    Cleaning cuts, abrasions and other minor injuries to help
    prevent infection from occurring                                      Refer to the New Zealand formulary for available
                                                                     antiseptics and subsidy details
    Hand washing to prevent cross-contamination

    Prior to surgical procedures to reduce resident skin flora

    In the prevention of recurrent skin infections to reduce
    bacterial load on the skin (Page 31)                                 Take home messages
                                                                              Antibiotics are not required for all skin infections;
                                                                              only use them when they are clinically indicated
N.B. Antiseptic solutions can cause irritation or contact                     Use topical antibiotics for small areas of localised
dermatitis in some people, and some products may stain the                    impetigo and oral antibiotics for more extensive
skin.22                                                                       infections
                                                                              If a topical antibiotic is the most appropriate
                                                                              treatment option, use fusidic acid as first-line
Most antiseptics reduce bacterial load: the clinical
                                                                              treatment, but be alert to the relatively high
significance of this is uncertain
                                                                              prevalence of resistance in S. aureus. Reserve the
Much of the evidence about antiseptics is in regards to their
                                                                              use of mupirocin for the treatment of infections
use in dressings for preventing infection in open wounds
                                                                              that are resistant to fusidic acid and susceptible
rather than as a treatment for minor skin infection.24 Many
                                                                              to mupirocin.
antiseptics do reduce bacterial load in a wound, but the
                                                                              In patients with recurrent skin abscesses,
clinical significance of this is uncertain. Bacterial load is also
                                                                              investigate for carriage of S. aureus and
not the only predictor of infection – other predictors include
                                                                              decolonise if present
the presence of foreign bodies in the wound, the patient’s co-
                                                                              Prevention is better than cure, so educate
morbidities and the virulence of the bacteria present.23 There
                                                                              patients about the importance of good hygiene
is evidence that some antiseptics can be toxic to human cells
                                                                              and keeping their skin healthy
important in the healing process, e.g. fibroblasts, keratinocytes
and leukocytes, however, this is usually only when antiseptics
are used at high concentrations.23, 24

                                                                                                                         BPJ Issue 64   33
Antibiotic use and resistance rates in New Zealand

New Zealand has one of the highest levels of antibiotic use       So what can we do?
in the world.27 Microbial resistance is directly related to the   The use of all antibiotics, including topical antibiotics, is
amount of an antimicrobial medicine that an organism              contributing to the increasing rates of antimicrobial resistance
is exposed to. Therefore the high rate of consumption of          in New Zealand and the rest of the world. Some things that
antibiotics in New Zealand means that we also have increasing     health care professionals can do to help preserve usefulness
rates of antibiotic resistance.27                                 of antibiotics include:27
                                                                      Do not prescribe an antibiotic when it is not required,
Antibiotic use is standardised in studies by reporting results
                                                                      e.g. for a viral upper respiratory tract infection, sinusitis,
as defined daily doses (DDD). The DDD is the amount of
                                                                      self-limiting cases of otitis media and conjunctivitis
medicine that is internationally agreed as the standard daily
                                                                      (which is often viral), boils (unless co-morbidities) and
dose when treating an otherwise healthy adult, e.g. the DDD
                                                                      most diarrhoeal illnesses
of oral amoxicillin is 1 g.
                                                                      Use an antibiotic appropriate for the infection, and
In a recent New Zealand study it was calculated that the annual       where possible avoid broad spectrum antibiotics, e.g.
per capita consumption of antibiotics in New Zealand in 2012          prescribe flucloxacillin for a S. aureus infection instead of
was approximately 25 DDDs/1000 people/day (i.e. an average            cephalexin or amoxicillin clavulanate
over the year of 25 daily treatment doses of an antibiotic,           Prescribe antibiotic treatment for the recommended
per 1000 people in New Zealand, per day).27 Compared to               duration and advise patients to complete the full course;
European countries, the volume of antibiotic consumption in           avoid prolonged or repeated courses without a strong
New Zealand was higher than in the United Kingdom, Spain,             clinical justification
the Netherlands, Scandinavia, the Czech Republic, Austria and         Prioritise consideration of antibiotic resistance, over
Germany, and only lower than in Greece, Belgium, France and           palatability and convenience for the patient, when
Italy.27                                                              deciding which antibiotic to prescribe

Use of broad-spectrum antibiotics is a contributing factor to     Patient education is also important in reducing the
antibiotic resistance and narrow-spectrum antibiotics should      inappropriate use of antibiotics. This includes:
be used where possible. In 2012, narrow-spectrum penicillins          Inform the patient about the problems associated with
represented only 21% of the total number of DDDs of various           the increasing rates of antimicrobial resistance
penicillins consumed by patients in the community in New              Ensure the patient understands what the antibiotic is
Zealand.27                                                            being prescribed for, what dose to take and how often
                                                                      Educate the patient about the importance of completing
There are still relatively effective treatments for most              the full course of antibiotic treatment
antibiotic-resistant bacteria seen in New Zealand, although           Encourage the patient to appropriately dispose of any
these treatments are not necessarily cost effective, and can          antibiotic that may be left over after completion (e.g.
be associated with significant adverse effects. However, some         unused topical antibiotic) or cessation of treatment (e.g.
strains of treatment-resistant Escherichia coli and Klebsiella        antibiotic changed due to susceptibility), and not to use
pneumoniae are now beginning to be seen in New Zealand.               it for a subsequent infection
                                                                      Ensure the patient is aware that the antibiotic being
If these resistant strains become prevalent, this will have
                                                                      prescribed is for them only and should not be used by
serious consequences for the provision of surgical treatments,
                                                                      family members or friends
such as implantation of prostheses or organ transplant, where
                                                                      Educate the patient that the antibiotic should only be
the risk of fatal infection and increased morbidity from failed
                                                                      used for the condition it was prescribed for and should
procedures would be high.27
                                                                      not be used for other conditions, e.g. topical antibiotics
                                                                      should not be applied to minor cuts and abrasions

34   BPJ Issue 64
ACKNOWLEDGEMENT: Thank you to Dr Emma Best, Paediatric Infectious Diseases Consultant, Starship Children’s
     Health and Senior Lecturer, Paediatrics, University of Auckland, Dr Rosemary Ikram, Clinical Microbiologist, Christchurch,
     Dr Diana Purvis, Paediatric Dermatologist, Starship Children’s Health, Associate Professor Mark Thomas, School of
     Medical Sciences, University of Auckland and Infectious Diseases Specialist, Auckland DHB and Dr Arlo Upton, Clinical
     Microbiologist Labtests Auckland and Infectious Diseases Specialist, Auckland DHB, for expert review of this article.

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